\textbf{227.} Considering the reactions below and their equilibrium constants, if the initial concentration of each of substances A and E in a closed container is $1\ \text{mol.L}^{-1}$, after equilibrium of Z is established, the concentration is how many mol per liter?
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\textbf{I)} $\ \text{A}(\text{g}) + \text{E}(\text{g}) \rightleftharpoons 2\text{X}(\text{g})$, $\quad K_1 = 32$
\textbf{II)} $\ 2\text{X}(\text{g}) \rightleftharpoons 2\text{Z}(\text{g})$, $\quad K_2 = 2$
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(1) $0/8$ \quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad (2) $1/6$
(3) $2/4$ \quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad (4) $3/2$
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